AirHint found the following cheapest return flights from Ontario (ONT) to Sao Paulo (GRU) in September 2025 (see full year).

Return flights

04 Sep - 09 Sep	Avianca
06 Sep - 11 Sep	Avianca
09 Sep - 16 Sep	Avianca
05 Sep - 19 Sep	United
09 Sep - 23 Sep	United
10 Sep - 24 Sep	United
12 Sep - 26 Sep	United
17 Sep - 01 Oct	United
19 Sep - 03 Oct	United
20 Sep - 04 Oct	United
06 Sep - 20 Sep	United
08 Sep - 22 Sep	United
11 Sep - 25 Sep	United
29 Sep - 13 Oct	United
30 Sep - 14 Oct	United
18 Sep - 02 Oct	United
22 Sep - 06 Oct	United
24 Sep - 08 Oct	United
21 Sep - 05 Oct	United
26 Sep - 10 Oct	United

Also check the deals for one-way flights from Ontario to Sao Paulo in September.

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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Cheapest return flights from Ontario to Sao Paulo in September from $979

Return flights